[Elecraft] Atmospheric noise increases

[Fred Jensen]

If it is wide band, but not "all over the entire band,", it's probably 
not atmospheric noise, more likely created by humans [i.e. your 
neighbors].  Especially if it drifts up and down slowly.

Odds generally are that it's correlated with the slowly increasing use 
of LED and CFL lights ... and possibly increases in "indoor 
agriculture."  The latter can generally be identified by a fairly strict 
schedule of on and off.  I have one near me. :-)

73,

Fred K6DGW
- Northern California Contest Club
- CU in the 50th Running of the Cal QSO Party 3-4 Oct 2015
- www.cqp.org

On 7/23/2015 5:07 PM, w7hd at msn.com wrote:
> Has anyone else noticed the dramatic increase in atmospheric noise
> lately?  On 20M, 30M, and 40M especially, I see a wide-band noise source
> wandering back and forth across the bands.  At times it almost looks
> like a sine wave on the waterfall display.  The noise will vary from an
> S3 up to a 20/S9.   It is especially troublesome on the frequencies I
> use most, namely, 10.1389, 14.045, 14.070, 7045, and 7070.   With the
> antenna disconnected, the noise drops to S1 or less.